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Berger 215's in 300 win mag

 
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  #1  
Old 09-07-2013, 02:15 PM
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Berger 215's in 300 win mag

I have been working on a load for my semi-custom 300 win mag. I'm using RWS brass federal 215 primers and H-1000 with the Berger 215 hybrid. I did the seating depth test and found .010 off the lands to be the best. At 200 yards I will have 2 out of 3 within a 1/4" then the 3rd will open it up to 1- 1 1/4" group. The flyer isn't always the same shot. Any help would be appreciated.
Thanks
Jon
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Old 09-07-2013, 04:18 PM
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Re: Berger 215's in 300 win mag

Jon, 1" at 200 yards is .5 moa. Not to bad at all. But if you to try to tighten it up , have you tried backing off a grain or 2 and retest? I find RWS brass likes a bit lower charge due to the lower case volume. Just a thought.

Jeff
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Old 09-07-2013, 04:51 PM
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Re: Berger 215's in 300 win mag

Jeff,
Thanks for the reply. I tested up to 75.5 grains and the groups were about 1-1 1/2"s at 100 yards. With the ladder test 73.5 grains down to 72.5 grains looked promising. So hoping for the most velocity I tried the 73.5 grain load and tested for seating depth.
So do you think I should continue to back of on powder charge? My velocity now is between 2850 and 2875 based on impacts on a rock at 1212 yards. I was hoping for around 2950 for velocity. By the way this is a 28" 5c Benchmark barrel.
Thanks
Jon
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Old 09-07-2013, 05:12 PM
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Re: Berger 215's in 300 win mag

John, I have been a long time learning this but if you had some WW brass I would try it. I know the RWS is great brass and strong as heck but I feel it costs some velocity from the lower case volume. I would almost bet you will be closer to 77 gr + in WW brass. That will get you closer to 2950+. Now that said we all know we need to work up to max when we change component. I understand if you have just bought the RWS but this is the reason I am pulling away from it , velocity. I am not blaming the flyer on the brass, but just think a little more case space could help.. maybe?

So if you could get your hands on just a few pcs of WW to test it might be worth it.

Other than that a primer change to either a FED210 or if ultra cold sub zero temps are in the plan a CCI 250. Sometimes a primer change will bring it all together.

Jeff
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Old 09-07-2013, 05:26 PM
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Re: Berger 215's in 300 win mag

Jeff,
I have some once fired WW brass from a previous 300 win mag I had. I will go load some in .5 grain increments looking for signs of pressure. I will let you know what I find out.
Thanks
Jon
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Old 09-07-2013, 05:31 PM
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Re: Berger 215's in 300 win mag

Quote:
Originally Posted by jskmtd View Post
Jeff,
I have some once fired WW brass from a previous 300 win mag I had. I will go load some in .5 grain increments looking for signs of pressure. I will let you know what I find out.
Thanks
Jon
Thanks Jon , I will be interested if your findings are the same.

Jeff
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Old 09-07-2013, 10:55 PM
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Re: Berger 215's in 300 win mag

Quote:
Originally Posted by Broz View Post
John, I have been a long time learning this but if you had some WW brass I would try it. I know the RWS is great brass and strong as heck but I feel it costs some velocity from the lower case volume. I would almost bet you will be closer to 77 gr + in WW brass. That will get you closer to 2950+. Now that said we all know we need to work up to max when we change component. I understand if you have just bought the RWS but this is the reason I am pulling away from it , velocity. I am not blaming the flyer on the brass, but just think a little more case space could help.. maybe?

So if you could get your hands on just a few pcs of WW to test it might be worth it.

Other than that a primer change to either a FED210 or if ultra cold sub zero temps are in the plan a CCI 250. Sometimes a primer change will bring it all together.

Jeff
The smaller case capacity will INCREASE pressure, gaining velocity with lower powder charges. You will see max pressure earlier, so be wary of this. I got caught out with Nosler brass due to less capacity than Rem or Win brass. Velocity was identical at 2grs' s less than either of the other brands.

Without a chrony, doping off shooting rocks is not going to be as accurate, the BC is not constant in all velocity ranges, and you may be off quite a ways from the actual dope.

Cheers.

I have never seen a 300WinMag work well with standard primers and slow powders. I have had my best results with either WLRM or Fed215 primers.
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